Room temperature reaction between polycrystalline Ni/Al bilayers deposited in ultrahigh vacuum
- Brookhaven National Laboratory, Upton, New York 11973 (US)
The growth of polycrystalline Ni--Al bilayers deposited in ultrahigh vacuum ({ital P}{lt}10{sup {minus}9} Torr), and their modification by annealing are studied by Auger and photoemission spectroscopy. At room temperature, Ni deposition on Al causes a chemical shift of the 68-eV Al Auger line and photoemission shows that the Ni 3{ital d} valence-band states for thin Ni overlayers are narrower and shifted away from {ital E}{sub {ital f}} when compared to Ni metal. For Al deposited on Ni, the 68-eV Al Auger line also undergoes a chemical shift and photoemission shows the Ni 3{ital d} valence band is modified by the appearance of a new state at higher binding energy. Based on comparisons with photoemission and Auger data presented by others for Ni--Al intermetallic compounds, and photoemission, ion channeling and ion scattering results published for the chemically similar Pd--Al system, we conclude that polycrystalline Al and Ni films partially intermix and form a NiAl{sub 3}-like intermetallic compound at room temperature. We believe this Ni--Al compound may be found at the thin-film interface, at grain boundaries or on the surface of 3-D Ni or Al islands. Heating Ni/Al bilayers at 600 K promotes Al out diffusion and heating at higher temperatures leads to the formation of other Ni--Al compounds.
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 7109130
- Journal Information:
- Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA), Journal Name: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA) Vol. 8:1; ISSN JVTAD; ISSN 0734-2101
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360100* -- Metals & Alloys
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALLOYS
ALUMINIUM
ALUMINIUM COMPOUNDS
ANNEALING
AUGER ELECTRON SPECTROSCOPY
CHEMICAL REACTIONS
CRYSTALS
ELECTRON SPECTROSCOPY
ELEMENTS
HEAT TREATMENTS
INTERMETALLIC COMPOUNDS
LAYERS
MEDIUM TEMPERATURE
METALS
NICKEL
NICKEL COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
POLYCRYSTALS
SPECTROSCOPY
TEMPERATURE MEASUREMENT
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
ULTRAHIGH VACUUM